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The Photographic Fascination With Twins : The Picture Show. One of the photos that made photographer Diane Arbus famous was Identical Twins, Roselle, New Jersey, 1967; it reverberated in The Shining and probably influenced Mary Ellen Mark's twin photos.

It goes without saying that twins long have fascinated photographers — as well as scientists. How is it that identical twins with virtually identical DNA can be so different? Conversely, how is it that identical twins separated at birth can still have so much in common?

Henrietta

Archie. Henri. A Map of Gender-Diverse Cultures. On nearly every continent, and for all of recorded history, thriving cultures have recognized, revered, and integrated more than two genders.

Terms such as "transgender" and "gay" are strictly new constructs that assume three things: that there are only two sexes (male/female), as many as two sexualities (gay/straight), and only two genders (man/woman). Yet hundreds of distinct societies around the globe have their own long-established traditions for third, fourth, fifth, or more genders.

The subject of Two Spirits, Fred Martinez, for example, was not a boy who wanted to be a girl, but both a boy and a girl — an identity his Navajo culture recognized and revered as nádleehí. Meanwhile, Hina of Kumu Hina is part of a a native Hawaiian culture that has traditionally revered and respected mahu, those who embody both male and female spirit.
Refuting genetic determinism. Twin studies are pretty much useless.

By Brian Palmer Updated Wednesday, Aug. 24, 2011, at 3:17 AM ET One of the main messages of science over the last couple of decades is that genes are destiny. With every new issue of a psychology journal, it seems that the portion of your life governed purely by your own free will gets smaller and smaller. Genes determine 50 percent of the likelihood that you will vote. Half of your altruism.
Clef. There are three types of clef used in modern music notation: F, C, and G.

Each type of clef assigns a different reference note to the line on which it is placed. Once one of these clefs has been placed on one of the lines of the stave, the other lines and spaces can be read in relation to it. In order to facilitate writing for different tessituras, any of the clefs may theoretically be placed on any of the lines of the stave. The further down on the stave a clef is placed, the higher the tessitura it is for; conversely, the higher up the clef, the lower the tessitura.